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Original question:

AFE7769: AFE7769: Layout suggestion || RF side

AFE7769: Query regarding Layout(Analog Ground Pins)

Pavan Kalyan
Prodigy 225 points
Part Number: AFE7769

Hi,
In AFE7769D Datasheet it's mentioned to separate the AGND, DGND, PLL_GND, CLK_GND
In Latest Eval board I have observed that the E14, H14, N14, T14 Are connected to PLL_GND

Is it ok If we follow Eval board or Do we need to Consider anything extra for the Best performance?
Kindly Confirm the regarding the same

Regards 
Pavan 

  • +1
    TI__Intellectual 2070 points

    Pavan,

    Ideally, to avoid interference between different sections(analog, digital, PLL, clk...) of the device, the GND for each section should be separated.  However, we have been using the same layout for AFE7769 and AFE7769D and haven't had any layout related issues, so it is okay for you guys to follow the AFE7769D layout.  

    One additional point on this, separate digital and analog ground do not mean that the grounds are electrically separate in the system.  To ensure the voltage potential is consistent between all the different power rails, they have to be common at some point, preferably a single, low impedance point.

    Kevin

  • 0 in reply to Kevin Dai
    Prodigy 225 points

    Hi Kevin,
    Thanks for your confirmation.

    Regards 
    Pavan